I've used it on the tail end of a cycle long enough to notice results. I'm using a little off cycle with some GH and it's all right. Nothing spectacular. When you add AAS to the mix, it's a completely different story.
I would only use insulin with no AAS if I were being tested or had a condition where AAS would be completely inappropriate. If using it solo, I'd use it for nothing but refeeds or times when my body really feels bogged down. Too much will put on not only subcutaneous fat but visceral fat. Make sure your diet is spot on. If you've got anything but a perfect diet don't even let the thought of slin cross your mind.
Ohh, may want to invest in a BSL monitor. They're pretty snazzy. Even when I'm not using slin and just dieting hard, I plan on buying more testing strips. I've done a lot of testing before slin, as well as during. It's pretty important to know where your fasting glucose sits at.